package test;

import java.security.Security;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.spec.IvParameterSpec;


public class Wuxin {

	public static void main(String[] args) {
		String key="";
		String s1= jiami("",key);
		String s2=jiami("",key);
		String s3=jiami("",key);
		System.out.println(s1);
		System.out.println(s2);
		System.out.println(s3);
		System.out.println(jiemi(s1, key));
		System.out.println(jiemi(s2, key));
		System.out.println(jiemi(s3, key));
	}
	
	public static String jiami(String msg,String key){
		try{
			String jiami = java.net.URLEncoder.encode(msg, "utf-8").toLowerCase();
			String a = toHexString(encrypt(jiami, key)).toUpperCase();
			return a;
		}catch(Exception e){
		}
		return null;
	}
	
	public static String jiemi(String msg,String key){
		try{
			String b = java.net.URLDecoder.decode(decrypt(msg, key), "utf-8");
			return b;
		}catch(Exception e){
		}
		return null;
	}
	
	public static String decrypt(String message, String key) throws Exception {
		Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
		byte[] bytesrc = convertHexString(message);
		Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
		DESKeySpec desKeySpec = new DESKeySpec(key.getBytes("UTF-8"));
		SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
		SecretKey secretKey = keyFactory.generateSecret(desKeySpec);
		IvParameterSpec iv = new IvParameterSpec(key.getBytes("UTF-8"));

		cipher.init(Cipher.DECRYPT_MODE, secretKey, iv);

		byte[] retByte = cipher.doFinal(bytesrc);
		return new String(retByte);
	}


	public static byte[] encrypt(String message, String key) throws Exception {
		Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
		Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");

		DESKeySpec desKeySpec = new DESKeySpec(key.getBytes("UTF-8"));

		SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
		SecretKey secretKey = keyFactory.generateSecret(desKeySpec);
		IvParameterSpec iv = new IvParameterSpec(key.getBytes("UTF-8"));
		cipher.init(Cipher.ENCRYPT_MODE, secretKey, iv);

		return cipher.doFinal(message.getBytes("UTF-8"));
	}

	public static byte[] convertHexString(String ss) {
		byte digest[] = new byte[ss.length() / 2];
		for (int i = 0; i < digest.length; i++) {
			String byteString = ss.substring(2 * i, 2 * i + 2);
			int byteValue = Integer.parseInt(byteString, 16);
			digest[i] = (byte) byteValue;
		}

		return digest;
	}

	public static String toHexString(byte b[]) {
		StringBuffer hexString = new StringBuffer();
		for (int i = 0; i < b.length; i++) {
			String plainText = Integer.toHexString(0xff & b[i]);
			if (plainText.length() < 2)
				plainText = "0" + plainText;
			hexString.append(plainText);
		}
		return hexString.toString();
	}
}
